Chiral orbital current and anomalous magnetic moment in gapped graphene

Mikito Koshino

研究成果: Article査読

13 被引用数 (Scopus)

抄録

We present a low-energy effective-mass theory to describe a chiral orbital current and an anomalous magnetic moment in graphenes with a band gap and related materials. We explicitly derive a quantum-mechanical current distribution in general Bloch electron systems, which describes a chiral current circulation supporting the magnetic moment. We apply the formulation to gapped graphene monolayer, bilayer, and ABC-stacked multilayers to show that the chiral current is opposite between different valleys, and the corresponding magnetic moment accounts for valley splitting of Landau levels. In a gapped bilayer and ABC multilayer graphenes, in particular, the valley-dependent magnetic moment is responsible for huge paramagnetic susceptibility at low energy, which enables a full valley polarization up to relatively high electron densities. The formulation also applies to the gapped surface states of a three-dimensional topological insulator, where the anomalous current is related to the magnetoelectric response in a spatially modulated potential.

本文言語English
論文番号125427
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
84
12
DOI
出版ステータスPublished - 2011 9 12

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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